Jet motor and method for providing rotation in a downhole tool

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/02 (2006.01) F03B 13/02 (2006.01) F03B 15/20 (2006.01)

Patent

CA 2646326

The invention comprises a downhole jet motor, and a method of using same, that can be utilized to drill or to clean a well bore or tubing. The jet motor comprises a power shaft partially surrounded by a control sleeve defining a blind annular space, closed at the upper end and open at the lower end to allow fluid discharge. At least one opening is provided in the drive shaft wall extending radially within the annulus region. Drilling or cleaning fluid pressure is directed to the at least one opening in the power shaft. The control sleeve provides a reaction structure in relation to fluid discharged from the at least one opening producing rotation of the drive shaft in relation to the control sleeve.

La présente invention concerne un moteur à réaction pour fond de puits, ainsi que son procédé d'utilisation, pouvant être utilisé pour forer ou nettoyer un puits ou une colonne de forage. Le moteur à réaction comprend un arbre de commande partiellement entouré d'une douille de commande définissant un espace annulaire aveugle, fermé au niveau de l'extrémité supérieure et ouvert au niveau de l'extrémité inférieure pour permettre le refoulement de fluide. Au moins une ouverture est prévue dans la paroi d'arbre de transmission s'étendant radialement dans la région annulaire. La pression du fluide de forage ou de nettoyage est dirigée vers la ou les ouvertures de l'arbre de commande. La douille de commande fournit une structure de réaction par rapport au fluide refoulé de la ou des ouvertures, entraînant la rotation de l'arbre de transmission par rapport à la douille de commande.

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